| Cab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport system -> Monitor Keywords |
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Cab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport systemRelated Patent Categories: Refrigeration, With Vehicle FeatureCab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060207275, Cab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport system. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a continuation patent application of International Application No. PCT/SE2004/001680 filed 17 Nov. 2004 which is published in English pursuant to Article 21(2) of the Patent Cooperation Treaty and which claims priority to Swedish Application Nos. 0303394-1 filed 10 Dec. 2003 and 0402661-3 filed 1 Nov. 2004. Said applications are expressly incorporated herein by reference in their entireties. TECHNICAL FIELD [0002] This invention relates to a vehicle cab comprising a roof supported upon a wall shell. The cab bears a heat-evacuating device comprising a fan and a condenser, the latter of which has a flat basic shape defined in general terms by two opposing large faces. The invention also relates to a vehicle provided with a cab of the disclosed type. BACKGROUND OF THE INVENTION [0003] The present invention has its background in the need to transport heat out of the air in a driver's cab such as that disposed on a working machine or the like, and hence constitutes an operator work space/environment. During an ordinary work session, the vehicle is often unprotected from the sun since the majority of tasks for such a work vehicle is used are located in open spaces without any protective shade. Since the working environment around the vehicle is often noisy and dirty, it is usually not a comfortable option for the operator to carrying out his or her work with the doors of the driver's cab open. Owing to the nature of the work, a further problem with the working condition for the operator is that the driver's cab must have large windows to allow good visibility. The sun, combined with the conditions in the driver's cab (small and trapping the driver's body heat) and the working environment (also often hot), causes the temperature in the driver's cab to often rise as high as 50-60.degree. C. [0004] A generally recognized way of solving the abovementioned problems is to install an air- conditioning device in the vehicle. Such a device comprises a closed line system which transports a fluid between an evaporator located in the driver's cab, which absorbs heat from the air in the driver's cab, and a condenser situated outside the driver's cab, which releases heat into the ambient air. [0005] EP 1,273, 467 shows a heat exchanger which is placed in the engine compartment of the vehicle in front of the vehicle engine, more precisely together with an engine-cooling system. A drawback with such a placement is that the very same air flow which passes through the heat exchanger also passes through a radiator located in the engine-cooling system. This air flow is created by a common fan, which thus has to endeavor to ensure that both the radiator of the engine and the heat exchanger will get sufficient air passing through them. The radiator and the heat exchanger often have different momentary requirements for cooling air (need the cooling air at different times) and therefore the cooling fan is consequently running more or less all of the time which is more than either of the radiator or heat exchanger independently require. It should also be noted that disruptions to engine-cooling capacity because of the heat exchanger(s) can result in a reduction in engine cooling effect and possibly cause damage to the engine itself. [0006] The problem with the abovementioned placement, as is shown, inter alia, in U.S. Pat. No. 3,983,715, U.S. Pat. No. 4,098,093 and U.S. Pat. No. 4,567,734, has been solved by placing the heat exchanger in a place separated from the engine compartment of the vehicle. The two first-named publications, U.S. Pat. No. 3,983,715 and U.S. Pat. No. 4,098,093, show a heat exchanger which is placed up on the roof of the vehicle cab. This placement means that the vehicle is made taller, which is a clear drawback for vehicles in certain environments. The designs of the illustrated devices also mean that a severe diversion of the cooling air has to be made, resulting in power losses in the line system. Their designs also mean that dirt can easily block the air intake and or the actual heat exchanger. The last-named publication, U.S. Pat. No. 4,567,734, shows a device which is placed on the front side of a platform body disposed behind the driver's cab so as to make use of the air draught created during travel of the vehicle. In order to exploit the advantages of such a placement, the vehicle is required to move at a substantial speed. Normal use of a working machine means that such a speed is only exceptionally reached. As an example, front-loader working machines operate on short cycles of forward and return travel for the loading of gravel or the like. [0007] It can generally be stated that, if the condenser is placed separated from the engine-cooling system, i.e. the condenser is isolated both functionally and physically from the engine-cooling system of the vehicle, problems can arise depending on where the condenser is in fact placed. The placement must allow sufficient air currents to flow to and from the condenser and the condenser must not disturb the view or be easily damageable by the surroundings of the vehicle. One drawback with placing a condenser with associated fan, operating on constantly high power (maximum power), on top of or on the side of the cab is that sound is easily transmitted into the cab. SUMMARY OF THE INVENTION [0008] One object of the present invention is to eliminate the abovementioned drawbacks with previously known condenser placements and to present an improved solution. A fundamental object is to present a heat-evacuating device which projects transversely from a vehicle in order to ensure that the air flow passing through the heat-evacuating device is not disturbed by the rest of the vehicle design. A second object is to present a heat-evacuating device which is cleaned automatically when it is switched off. It is also an object to have a heat-evacuating device which, when it is mounted on the vehicle, does not affect the view of the operator. It is additionally an object to create a heat-evacuating device with longer working life. [0009] A further object is to create a heat transport system with a smaller cooling medium requirement. Yet another object is to present a heat transport system that runs more quietly than previous cooling systems of the instant type. [0010] In a first aspect, the present invention relates to a cab of the type defined above and which is characterized in that the cooling condenser projects from the wall shell, with its large faces at right angles to the wall shell. The condenser is principally disposed in this way so that the air flow through the heat-evacuating device shall not be diverted and in order to provide a simpler cleaning. Preferably, the condenser is situated in the region of the upper part of the wall shell and preferably on a rear wall of the wall shell since this region is one of the least dirty about the vehicle and the view of the operator is not disturbed (interrupted) with such a placement. [0011] In a second aspect, the invention relates to the vehicle defined in the introduction, which is characterized in that it comprises a cab according to the invention. [0012] In a third aspect, the invention also relates to a method for controlling a heat transport system, preferably a heat transport system comprising a heat-evacuating device according to the invention. The advantage with said method and device is that the rotation of the condenser fan is adjustable, which means that the air flow passing through the condenser at each moment corresponds to the cooling requirement of the fluid at said moment. As a result of the abovementioned coordinated fluid cooling, the fluid pressure affected by the fluid temperature can be kept at or close to a predetermined level. By virtue of the reduced variation in the fluid pressure, the stress upon the components of the heat transport system is reduced, thereby increasing their working life. By adjusting the power of the condenser fan so that it does not need to operate on constantly high power (maximum power), the noise level is also reduced and a placement on top of or on the side of the cab poses no problems for the operator of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS [0013] The invention will be described below, for illustrative purposes, with reference to the accompanying drawings, in which: [0014] FIG. 1 is a perspective view of a working machine with a cab-fitted heat-evacuating device; [0015] FIG. 2 is an enlarged perspective view of an exposed condenser with associated condenser fans; [0016] FIG. 3 is a side view of a working machine with a heat-evacuating device disposed on the rear wall of the cab; [0017] FIG. 4 is a side view of an exposed cab with a the heat-evacuating device disposed on the front wall of the cab; [0018] FIG. 5 is a side view of an exposed cab with the heat-evacuating device slightly angled relative to the horizontal plane; and [0019] FIG. 6 is a diagrammatic representation of a closed heat transport system. Continue reading about Cab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport system... Full patent description for Cab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cab for a vehicle, vehicle with such cab and method and device for controlling a closed heat transport system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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